999788904449 has 2 divisors, whose sum is σ = 999788904450. Its totient is φ = 999788904448.

The previous prime is 999788904421. The next prime is 999788904467. The reversal of 999788904449 is 944409887999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995165856400 + 4623048049 = 997580^2 + 67993^2 .

It is a cyclic number.

It is not a de Polignac number, because 999788904449 - 2³² = 995493937153 is a prime.

It is not a weakly prime, because it can be changed into another prime (999748904449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499894452224 + 499894452225.

It is an arithmetic number, because the mean of its divisors is an integer number (499894452225).

It is a Proth number, since it is equal to 953473 ⋅ 2²⁰ + 1 and 953473 < 2²⁰.

Almost surely, 2^999788904449 is an apocalyptic number.

It is an amenable number.

999788904449 is a deficient number, since it is larger than the sum of its proper divisors (1).

999788904449 is an equidigital number, since it uses as much as digits as its factorization.

999788904449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693052928, while the sum is 80.

The spelling of 999788904449 in words is "nine hundred ninety-nine billion, seven hundred eighty-eight million, nine hundred four thousand, four hundred forty-nine".